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Finding the Fourth Proportional to 139.30, 192.10 and 92.63

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Solution

The fourth proportional to 139.30, 192.10 and 92.63 is: 127.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.30 : 192.10 = 92.63 : x
  2. Step 2: Convert to fraction form
    139.30/192.10 = 92.63/x
  3. Step 3: Cross multiply
    139.30x = 192.10 × 92.63
  4. Step 4: Simplify right side
    139.30x = 17,794.22
  5. Step 5: Solve for x
    x = 17,794.22/139.30
  6. Step 6: Final answer
    x = 127.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.